<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/logo.png"
             alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info"
                 @click="logOut">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle_button"
             @click="toggleCollapse">|||</div>
        <el-menu background-color="#313743"
                 text-color="#fff"
                 active-text-color="#409eff"
                 unique-opened
                 :collapse="isCollapse"
                 :collapse-transition="false"
                 router
                 :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''"
                      v-for="item in menuList"
                      :key="item.id">
            <template slot="title">
              <i :class="iconsObj[item.id]"></i>
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path"
                          v-for="subItem in item.children"
                          :key="subItem.id"
                          @click="saveNavState('/' + subItem.path)">
              <template slot="title">
                <i class="el-icon-menu"></i>
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
import requestMenuList from '../network/menuList';
export default {
  name: 'Home',
  data () {
    return {
      //左侧菜单数据
      menuList: [],
      iconsObj: {
        '111': 'el-icon-s-promotion',
        '125': 'iconfont icon-users',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      //是否折叠
      isCollapse: false,
      //被激活的链接地址
      activePath: '',
      welcome: {
        authName: '欢迎光临',
        id: 111,
        order: 1,
        path: '/welcome',
        children: [
          {
            authName: 'Welcome',
            id: 666,
            order: 1,
            path: 'welcome',
            children: []
          }
        ]
      }
    }
  },
  created () {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath');
  },
  methods: {
    logOut () {
      window.sessionStorage.clear();
      this.$router.push('/login');
    },
    //获取所有的菜单
    async getMenuList () {
      const res = await requestMenuList();
      //console.log(res);
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg);
      } else {
        res.data.unshift(this.welcome);//菜单中追加welcome
        this.menuList = res.data;

      }
    },
    //切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse;
    },
    //保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath);
      this.activePath = activePath;
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #363d40;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    img {
      width: 25px;
      height: 25px;
      border-radius: 50%;
      margin-left: 10px;
    }
    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #313743;
  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #eaedf1;
}

.iconfont {
  margin-right: 10px;
}

.toggle_button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  color: #fff;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>